A substance that contains polar covalent bonds may not be overall polar ... This means that the molecule itself is non-polar due to symmetry.

In the water molecule, the oxygen and hydrogen atoms share electrons in covalent bonds ... Alcohol has one O–H bond which is polar, but a large portion of the molecule is made up of C–H bonds which ...

with a large difference indicating a polar covalent bond (e.g., H-F bond) and a small difference indicating a non-polar covalent bond (e.g., C-C bond). Electronegativity is crucial for explaining ...